This is an excellent burn - goes in the "best burns" category.
All non-premium discs are of slightly lesser quality near the edge, which probably explains the extremely slight drop in quality you see in your scan.
But you shouldn't take such tiny differences seriously, even less so in NEC scans: PIE reporting of NEC drives (including the 3540, which is actually the only reliable NEC scanner to date) have a "magnifying" effect on any small change. Besides they report much higher PIE levels than most other scanning drives. As for the PIF figures, the difference in you scan is far too tiny to draw any conclusion. :disagree:. Calling that a "cluster" is not correct.
Now... I have had lots of G04 going bad last year. Only way to tell about yours: as TimC mentions, re-scan the discs in a couple of months. In general, these G04/G05, when degrading:
1. First show an increase in PIE levels and totals
2. Then show an increase in PIF totals
3. Only then PIF levels start to raise.
Hope this helps